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检索条件"主题词=Algorithm development"

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Simulation and accuracy evaluation of filtration algorithms used in industrial processes

Simulation and accuracy evaluation of filtration algorithms ...

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Conference on Photonics, Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments IV

作者： Holiczer, A Bialystok Tech Univ Dept Elect Engn PL-15351 Bialystok Poland

ISBN: (纸本)081946211X

The present paper deals with the simulation of various filtration algorithms used in industrial processes estimation. Accuracy of these algorithms will be evaluated. A flame photometer will be used as an industrial signal source. algorithms will be used for determination of nanoconcentrations of sodium and potassium in water solutions. Measurement process will consist of a signal proportional to concentration, measurement noise and outliers. Very good accuracy of designed estimation filter will be shown. Advantages of presented filter will be used to determine the detection threshold in flame photometry.

关键词： Filtering (signal processing) Signal processing Digital filtering Electronic filtering Photometry Sodium Computer simulations Signal detection algorithm development Linear filtering

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NOAA - ISRO joint science projects on earth observation system science, technology, and applications for societal benefits

NOAA - ISRO joint science projects on earth observation syst...

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Conference on GEOSS and Next-Generation Sensors and Missions

作者： Powell, A. Jayarman, V. Kondragunta, S. Kogan, F. Kuligowski, R. Maturi, E. NOAA NESDIS Ctr Satellite Applicat & Res Camp Springs MD 20746 USA ISRO Bangalore Karnataka India

ISBN: (纸本)9780819465146

India and the United States of America (U.S.A.) held a joint conference from June 21-25, 2004 in Bangalore, India to strengthen and expand cooperation in the area of space science, applications, and commerce. Following the recommendations in the joint vision statement released at the end of the conference, the National Oceanic and Atmospheric Administration (NOAA) and the Indian Space and Reconnaissance Organization (ISRO) initiated several joint science projects in the area of satellite product development and applications. This is an extraordinary step since it concentrates on improvements in the data and scientific exchange between India and the United States, consistent with a Memorandum of Understanding (MOU) signed by the two nations in 1997. With the relationship between both countries strengthening with President Bush's visit in early 2006 and new program announcements between the two countries, there is a renewed commitment at ISRO and other Indian agencies and at NOAA in the U.S. to fulfill the agreements reached on the joint science projects. The collaboration is underway with several science projects that started in 2005 providing initial results. NOAA and ISRO agreed that the projects must promote scientific understanding of the satellite data and lead to a satellite-based decision support systems for disaster and public health warnings. The projects target the following areas: Supporting a drought monitoring system for India Improving precipitation estimates over India from Kalpana-1 Increasing aerosol optical depth measurements and products over India Developing early indicators of malaria and other vector borne diseases via satellite monitoring of environmental conditions and linking them to predictive models Monitoring sea surface temperature (SST) from INSAT-3D to support improved forecasting of regional storms, monsoon onset and cyclones The research collaborations and results from these projects will be presented and discussed in the context of I

关键词： Satellites algorithm development Aerosols Vegetation Meteorological satellites Meteorology Atmospheric modeling Environmental sensing Sensors Climatology

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A power autonomous monopedal robot

A power autonomous monopedal robot

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Conference on Sensors, and Command, Control, Communications, and Intelligence (C31) Technologies for Homeland Secuity and Homeland Defense V

作者： Krupp, Benjamin T. Pratt, Jerry E. Yobot Inc Cincinnati OH 45203 USA Florida Inst Human & Machine Cognit Pensacola FL USA

ISBN: (纸本)0819462578

We present the design and initial results of a power-autonomous planar monopedal robot. The robot is a gasoline powered, two degree of freedom robot that runs in a circle, constrained by a boom. The robot uses hydraulic Series Elastic Actuators, force-controllable actuators which provide high force fidelity, moderate bandwidth, and low impedance. The actuators are mounted in the body of the robot, with cable drives transmitting power to the hip and knee joints of the leg. A two-stroke, gasoline engine drives a constant displacement pump which pressurizes an accumulator. Absolute position and spring deflection of each of the Series Elastic Actuators are measured using linear encoders. The spring deflection is translated into force output and compared to desired force in a closed loop force-control algorithm implemented in software. The output signal of each force controller drives high performance servo valves which control flow to each of the pistons of the actuators. In designing the robot, we used a simulation-based iterative design approach. Preliminary estimates of the robot's physical parameters were based on past experience and used to create a physically realistic simulation model of the robot. Next, a control algorithm was implemented in simulation to produce planar hopping. Using the joint power requirements and range of motions from simulation, we worked backward specifying pulley diameter, piston diameter and stroke, hydraulic pressure and flow, servo valve flow and bandwidth, gear pump flow, and engine power requirements. Components that meet or exceed these specifications were chosen and integrated into the robot design. Using CAD software, we calculated the physical parameters of the robot design, replaced the original estimates with the CAD estimates, and produced new joint power requirements. We iterated on this process, resulting in a design which was prototyped and tested. The Monopod currently runs at approximately 1.2 m/s with the weight of all t

关键词： Actuators Computer aided design Servomechanisms Switches Device simulation System integration algorithm development Amplifiers Carbon SolidWorks

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A pixelwise inpainting-based refinement scheme for quantizing calcification in the lumbar aorta on 2D lateral x-ray images

A pixelwise inpainting-based refinement scheme for quantizin...

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Medical Imaging 2006 Conference

作者： Conrad-Hansen, Lars A. De Bruijne, Marleen Lauze, Franqois Tanko, Laszlo B. Nielsen, Mads IT Univ Copenhagen Copenhagen Denmark Ctr Clin & Basic Res Copenhagen Denmark

ISBN: (纸本)0819464236

In this paper we seek to improve the standard method of assessing the degree of calcification in the lumbar aorta visualized on lateral 2-D X-rays. The semiquantitative method does not take density of calcification within the individual plaques into account and is unable to measure subtle changes in the severity of calcification over time. Both of these parameters would be desirable to assess, since they are the keys to assessing important information on the impact of risk factors and candidate drugs aiming at the prevention of atherosclerosis. As a further step for solving this task, we propose a pixelwise inpainting-based refinement scheme that seeks to optimize the individual plaque shape by maximizing the signal-to-noise ratio. Contrary to previous work the algorithm developped for this study uses a sorted candidate list, which omits possible bias introduced by the choice of starting pixel. The signal-to-noise optimization scheme will be discussed in different settings using TV as well as Harmonic inpainting and comparing these with a simple averaging process.

关键词： Signal to noise ratio X-rays X-ray imaging Gold Signal processing Visualization algorithm development Calcium Image segmentation Image processing

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Automatic clustering based on an information-theoretic approach with application to spectral anomaly detection - art. no. 623517

Automatic clustering based on an information-theoretic appro...

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Conference on Signal Processing, Sensor Fusion, and Target Recognition XV

作者： Carlotto, Mark J. 8 Milne Way Gloucester MA 01930 USA

ISBN: (纸本)0819462918

An information-theoretic method is described for automatically determining the best number of clusters. it is motivated by Rissanen's minimum description length principle that states the best representation is the one with the fewest bits. The method is evaluated using two different clustering algorithms: a mode finder based on scale-space algorithm, and a vector quantizer (VQ). Synthetic, single- and multi-band image clustering examples are presented. Clusterings produced by the mode finder are shown to better correspond to distinguishable surface categories in the scene than those produced by the VQ algorithm. VQ clusterings are evaluated within an anomaly detector, which detects manmade object/changes as spectral outliers within a set of background clusters. It is shown that the optimal VQ clustering (the one with the fewest bits) produces the best detection performance.

关键词： Quantization Earth observing sensors High resolution satellite images Detection and tracking algorithms Expectation maximization algorithms Mahalanobis distance algorithm development Data modeling Sensors Statistical modeling

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How efficient is BitTorrent?

How efficient is BitTorrent?

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Conference on Multimedia Computing and Networking 2006

作者： Wu, G Chiueh, TC SUNY Stony Brook Dept Comp Sci Stony Brook NY 11794 USA

ISBN: (纸本)0819461113

BitTorrent is arguably the most popular media file distribution protocol used in Internet today. Even though empirically BitTorrent seems to be both efficient and scalable, there has been very little research on the detailed dynamics of its built-in control mechanisms, and their effectiveness across a wide variety of network configurations and protocol parameters. The main goal of this paper is to answer the question of how close BitTorrent is to the optimum, and indirectly how much room there is for further performance optimizations. We develop a centrally scheduled file distribution (CSFD) protocol that can provably minimize the total elapsed time of a one-sender-multiple-receiver file distribution task, and perform a comprehensive comparison between BitTorrent with CSFD. In addition, we compare several peer selection algorithms and analyze the applicability of BitTorrent to real-time streaming applications.

关键词： Receivers Internet Systems modeling Multimedia algorithm development Computer programming Data modeling Performance modeling Computer science Electronic imaging

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Advanced DFM applications using Design Based Metrology on CD SEM

Advanced DFM applications using Design Based Metrology on CD...

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Conference on Metrology, Inspection, and Process Control for Microlithography XX

作者： Lorusso, G. F. Capodieci, L. Stoler, D. Schulz, B. Roling, S. Schramm, J. Tabery, C. Shah, K. Singh, B. Abbott, G. Roberts, A. Azordegan, A. Heinrichs, L. Kaliblotzky, Z. Castel, E. KLA Tencor San Jose CA 95134 USA Adv Micro Devices Inc Sunnyvale CA 94088 USA

ISBN: (纸本)0819461954

Design Based Metrology (DBM) implements a novel automation flow, which allows for a direct and traceable correspondence to be established between selected locations in product designs and matching metrology locations on silicon wafers. Thus DBM constitutes the fundamental enabler of Design For Manufacturability (DFM), because of its intrinsic ability to characterize and quantify the discrepancy between design layout intent and actual patterns on silicon. The evolution of the CD-SEM into a DIM tool, capable of measuring thousands of unique sites, includes 3 essential functionalities: (1) seamless integration with design layout and locations coordinate system;(2) new design-based pattern recognition and (3) fully automated recipe generation. Additionally advanced SEM metrology algorithms are required for complex 2-dimensional features, Line-Edge-Roughness (LER), etc. In this paper, we consider the overall DBM flow, its integration with traditional CD-SEM metrology and the state-of-the-art in recipe automation success. We also investigate advanced DFM applications, specifically enabled by DBM, particularly for OPC model calibration and verification, design-driven RET development and parametric Design Rule evaluation and selection.

关键词： Semiconducting wafers Metrology Optical proximity correction Pattern recognition Design for manufacturing Scanning electron microscopy Calibration algorithm development Computer aided design Resolution enhancement technologies

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The relationship between air pollution and satellite data from OCTS

The relationship between air pollution and satellite data fr...

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Conference on algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XII

作者： Lim, H. S. MatJafri, M. Z. Abdullah, K. Saleh, N. M. Wong, C. J. Univ Sains Malaysia Sch Phys George Town 11800 Malaysia

ISBN: (纸本)0819462896

Air quality is a major concern in many large cities of the world. This paper studies the relationship between particulate matter of size less than 10-micron meter (PM10) and satellite observation from OCTS. The objective of this study is to map the PMIO distribution in Peninsular Malaysia using visible and thermal bands data. The in-situ PM 10 measurements were collected simultaneously with the acquisition of the satellite image. The reflectance values in the visible and digital numbers in the thermal bands were extracted corresponding to the ground-truth locations and later used for algorithm regression analysis of the air quality. A developed algorithm was used to predict the PM 10 values from the satellite image. The novelty of this study is the algorithm uses a combination of reflectance measurements from the visible bands and the corresponding apparent temperature values of the thermal band. This study investigates the relationship between the extracted OCTS signals and the PMIO values. The reflectance at 3.55-3.88 micro meter is computed after correction for the emission by the atmosphere. The surface emissivity values were computed based on the NDVI values. The developed algorithm produced a high correlation between the measured and estimated PMIO values of 0.97. Finally, a PMIO map was generated over Peninsular Malaysia using the proposed algorithm. This study has indicated the potential of OCTS satellite data for air quality study.

关键词： Reflectivity Optical coherence tomography Satellites algorithm development Earth observing sensors Aerosols Atmospheric particles Satellite imaging Infrared radiation Thermography

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Water quality change detection: multivariate algorithms

Water quality change detection: multivariate algorithms

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Conference on Optics and Photonics in Global Homeland Security II

作者： Klise, Katherine A. McKenna, Sean A. Sandia Natl Labs Geohydrol Dept POB 5800MS 0735 Albuquerque NM 87185 USA

ISBN: (纸本)0819462594

In light of growing concern over the safety and security of our nation's drinking water, increased attention has been focused on advanced monitoring of water distribution systems. The key to these advanced monitoring systems lies in the combination of real time data and robust statistical analysis. Currently available data streams from sensors provide near real time information on water quality. Combining these data streams with change detection algorithms, this project aims to develop automated monitoring techniques that will classify real time data and denote anomalous water types. Here, water quality data in I hour increments over 3000 hours at 4 locations are used to test multivariate algorithms to detect anomalous water quality events. The algorithms use all available water quality sensors to measure deviation from expected water quality. Simulated anomalous water quality events are added to the measured data to test three approaches to measure this deviation. These approaches include multivariate distance measures to 1) the previous observation, 2) the closest observation in multivariate space, and 3) the closest cluster of previous water quality observations. Clusters are established using kmeans classification. Each approach uses a moving window of previous water quality measurements to classify the current measurement as normal or anomalous. Receiver Operating Characteristic (ROC) curves test the ability of each approach to discriminate between normal and anomalous water quality using a variety of thresholds and simulated anomalous events. These analyses result in a better understanding of the deviation from normal water quality that is necessary to sound an alarm.

关键词： Quality measurement Distance measurement Sensors Detection and tracking algorithms Water algorithm development Homeland security Chlorine Computer security Safety

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Autonomous mine detection sensors (AMDS)

Autonomous mine detection sensors (AMDS)

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Conference on Detection and Remediation Technologies for Mines and Minelike Targets XI

作者： Navish, Frank May, Michael USA RDECOM CERDEC Night Vis & Electron Sensors Directorate 10221 Burbeck Rd Ft Belvoir VA 22060 USA Inst Def Analy Alexandria VA 22311 USA

ISBN: (纸本)081946273X

The Autonomous Mine Detection Sensors (AMDS) program is developing a prototype autonomous mine-detection sensor suite designed to be mounted on a small robotic platform that can find buried anti-personnel mines. Over the past two years, CyTerra Corp. and NIITEK, Inc. have developed complementary senor suites using a variety of ground penetrating radar (GPR) and electromagnetic induction (EMI) sensor configurations. The ANMS program is also working with industry and academia to develop automatic target recognition (ATR) algorithms. This paper provides a brief overview of evaluations that have been performed at Army facilities. Probability of Detection (Pd) and Probability of False Alarm (Pfa) results are provided for signal-to-noise type detection algorithms and also for promising pattern classification and neural network algorithms that were developed by Duke University, the University of Missouri-Columbia, and the University of Florida. After an evaluation in October 2005, both contractors' sensors performed comparably (about 90% Pd and 40% Pfa) against low-metal anti-personnel mines at an Army test site seeded with typical clutter. In some cases, university-developed pattern classification and neural network algorithms have reduced the Pfa by a factor of two against these clutter sets.

关键词： Sensors Mining General packet radio service Palladium Electromagnetic coupling Land mines Detection and tracking algorithms algorithm development Neural networks Evolutionary algorithms

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